Paper strength is affected by many factors, first of all into the paper fibers depends on the combination of force and strength of fiber itself, and the arrangement of fibers in paper and distribution. The most important is the inter-fiber bonding, fiber bonding generally have four: chemical bonds, hydrogen bonds, van der Waals force and woven fiber surface. Which hydrogen bonding is the bonding strength of paper generated by the main way, a considerable number of cellulose hydroxyl molecules by the formation of numerous micro-fiber hydrogen bonding between them is a great force, which is the main causes of dry strength. Dry strength agent is characterized by its molecular structure point of view are mostly multi-hydroxyl containing polymer, which is formed with the hydrogen bonding between cellulose molecules based, dry-strength agent molecules to form hydrogen bonds with the fiber surface groups hydroxyl form hydrogen bonds. Such as starch, glucose-free cellulose fiber surface hydroxyl groups involved in the formation of molecular hydrogen bond, so the starch to increase the internal fiber bonding, between the two beams of natural fiber surface increased with the number of hydrogen bonds. Dry strength agent while on the sheet forming process has a certain role in improving the dry strength agent at this time onwards the role of effective dispersant, the slurry or dry strength agent in the fiber distribution is more uniform, provide more fiber and between fibers and high molecules, thereby improving the dry strength.
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